Watch List notes:

William III (1694-1702), Sixpence, 1699, third bust right, rev. late harp with three strings, roses in angles (ESC 1246 [R2] {1578}; S.3547), a trace of double-striking and flan adjustment to periphery otherwise toned, extremely fine or better.
The incorporation of a 'rose' in the overall design was used to denote silver bullion originally supplied by mines from the West of England such as those in Bere Ferrers and Combe Martin (Devon), or Dulverton and Brushford on the Somerset border.
Estimate: £300 - £400